feat(x): resolve X handles for person/brand topics via agent WebSearch

When a topic is a person/brand (e.g. "Dor Brothers", "Jason Calacanis"),
the agent now resolves their X handle via WebSearch before running the
script, then passes --x-handle to search their posts unfiltered (no
topic keywords required). This finds posts the entity made without
mentioning their own name.

- SKILL.md + OpenClaw variant: Step 0.5 handle resolution instructions
- last30days.py: --x-handle CLI arg, passed through to _run_supplemental()
- bird_x.search_handles(): topic is now Optional[str] for unfiltered mode
- schema.py: resolved_x_handle field on Report
- render.py: show resolved handle in stats output

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/lib/schema.py

@@ -288,6 +288,8 @@ class Report:
     web_error: Optional[str] = None
     youtube_error: Optional[str] = None
     hackernews_error: Optional[str] = None
+    # Handle resolution
+    resolved_x_handle: Optional[str] = None
     # Cache info
     from_cache: bool = False
     cache_age_hours: Optional[float] = None
@@ -312,6 +314,8 @@ class Report:
             'prompt_pack': self.prompt_pack,
             'context_snippet_md': self.context_snippet_md,
         }
+        if self.resolved_x_handle:
+            d['resolved_x_handle'] = self.resolved_x_handle
         if self.reddit_error:
             d['reddit_error'] = self.reddit_error
         if self.x_error:
@@ -472,6 +476,7 @@ class Report:
             web_error=data.get('web_error'),
             youtube_error=data.get('youtube_error'),
             hackernews_error=data.get('hackernews_error'),
+            resolved_x_handle=data.get('resolved_x_handle'),
             from_cache=data.get('from_cache', False),
             cache_age_hours=data.get('cache_age_hours'),
         )